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Case Reports
. 2008 May;10(5):552-5.
doi: 10.1093/europace/eun083.

T-wave oversensing and inappropriate shocks: a case report

Komandoor Srivathsan  1 , Luis R Scott, Gregory T Altemose
Affiliations
Case Reports

T-wave oversensing and inappropriate shocks: a case report

Komandoor Srivathsan et al. Europace. 2008 May.

Abstract

A 27-year-old male with congenital long QT syndrome, SCN5A mutation experienced recurrent inappropriate exercise-related implantable cardioverter defibrillator (ICD) shocks. This device showed T-wave oversensing with double, which lead to these device discharges. Dynamic T-wave oversensing was reproducibly provoked at exercise treadmill testing and was confirmed as the mechanism leading to double counting. The insertion of a new pacing and sensing lead with increased R-wave amplitude did not solve the problem. Exchanging the existing ICD generator with one capable of automatic sensitivity control (Biotronik, Lexos DR, Biotronik, Berlin, Germany) completely eliminated T-wave oversensing and inappropriate shocks.

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